Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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portio K grauitas abſoluta pilæ aqueæ C quæ æqua
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lis ſit ipſi AB, ſit que pila C contenta intra eiuſdem̨
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aquæ RO profunditatem, vel in altera fiſtula inuerſi
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ſiphonis, quæ cum reliqua continuetur, poſtea eadem
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pila AB filo DA ab aliqua potentia I ſuſpenſa in me
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dio aquæ fixè retineatur. </
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">modò ſi poſſibile eſt pilą
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aquea C nil prorsùs ponderet in ipſamet aqua, igitur
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in ſiphone, vel in libra DE in eius puncto medio F
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fulta pila aquea C ſuſpenſa à termino E, quæ
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prorſus grauitatem exercere in aqua ſupponitur,
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quam</
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imminuet pondus contrapoſitæ pilæ AB colli
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gatæ termino libræ D, propterea quòd nihilum ab
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aliquo pondere ſubtractum ipſum nullo pacto immi
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nuit; nec pariter denſitas, & tenacitas aquæ gradum
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ponderis pilæ AB diminuere poteſt, propterea quòd
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illa reſiſtentia potis eſt retardare, & impedire mo
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tum, non autem vim, quam graue AB in quiete con
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ſtitutum exercet comprimendo; videmus enim, quòd
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pila ferrea quieſcens ſiue fulciatur à molli cera, ſiue
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à rigido adamante, ſemper eadem vi comprimit, ſci
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licet menſurata à gradu eius
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põderis
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. </
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Cap. 3. flui
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dum in ſuo
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toto quie
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ſcens pon
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derat.</
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<
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">His poſitis ſequitur, quòd pila fer
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rea AB pendula intra aquam exerce
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bit integram ſuam grauitatem IK,
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ſcilicet eam, quam in aere exerce
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bat, ſed hoc eſt falſum, imminuitur
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enim præcisè pro menſura ponderis
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K ſcilicet molis aqueæ C, & ei relin
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quitur tantummodò pondus I, ſcili-</
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